Lily's Twin (Severus Snape Love Story)

Hi, i'm Lilah evans. Everybody calls me lily though, thats my twin sisters name. She died a while ago, after she had harry potter with james. I didnt like james though, I kept one seeing him bullying people at hogwarts. I havent been to hogwarts for many years though so im wondring what would happen since im going back to hogwarts to assist madame pomfrey at the hospital wing and to help this professor snape with his potions so this will be interesting...

What will happen if a certain potions master sees a familiar face like lily's?